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Borrowings and Other Financing Instruments Term Loan (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Short-term Debt [Line Items]      
Amount outstanding at period end $ 463   $ 785
Proceeds from issuance of common stock 8 $ 6  
Letter of Credit      
Short-term Debt [Line Items]      
Amount outstanding at period end $ 44   $ 44